coz
conj.conj. a short, casual way to say 'because'. You use it in texts or when talking to friends to explain a reason.
conj. a non-standard, phonetic shortening of 'because'. Used to introduce a subordinate clause of reason or cause.
I'm staying home coz I'm tired.
I didn't call you back coz my phone died while I was on the bus.
He didn't bother checking the weather report coz he figured it would just be sunny like yesterday, but then it poured during the picnic.
Informal spelling; restricted to casual speech, texting, and social media. Not acceptable in academic or professional writing.
I stayed home coz of the rain.I stayed home because of the rain.While 'coz' replaces 'because', it is rarely used in the compound preposition 'because of' in writing; 'coz' usually introduces a full clause.